Date Format Problem in Excel

I have several large trade blotters I exported from our portfolio trading platform. Problem is, with the date, when it exports to excel, it exports the date as a single integer. For example, 05/15/2008 becomes 51508. 11/15/2008 becomes 111508. Pain the butt right?

Is there any possible formula that I can use convert these to regular date format? That way I can use the formula to get the correct date format, then copy special back into the correct column. There are literally thousands of entries so of course I don't want to manually do this.

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